Benefits
General Digestive Comfort
Supplemental peptidase enzymes can augment endogenous gastric and pancreatic protease activity at high-protein meals. This may help reduce post-meal bloating, heaviness, or discomfort in individuals whose digestive output may be lower or temporarily stressed.
Gluten Peptide Breakdown Support
Prolyl endopeptidases from Aspergillus species can hydrolyze proline-rich immunogenic peptides of gluten in vitro and in gastric simulation models. This activity is the rationale for marketing AN-PEP-based peptidase blends as accidental-exposure support for gluten-avoiders.
Casein and Dairy Peptide Digestion
DPP-IV and related proteases support breakdown of beta-casomorphin and similar exorphin peptides from dairy. Some users avoiding casein-sensitive symptoms report perceived benefit when peptidase is taken with occasional dairy exposure.
Plant Protein Digestibility
Peptidase blends can help break down plant proteins (peas, lentils, beans) that contain protease inhibitors and oligopeptides resistant to standard digestion. May support amino acid availability and reduce bloating after high plant-protein meals.
Mechanism of action
Endopeptidase Cleavage Activity
Fungal endopeptidases cleave internal peptide bonds in dietary proteins, producing shorter peptides accessible to brush-border peptidases. This complements endogenous pepsin and pancreatic protease activity, particularly during high-protein meals.
Prolyl Bond Hydrolysis (AN-PEP)
Aspergillus niger prolyl endopeptidase specifically cleaves peptide bonds C-terminal to proline residues — bonds that are resistant to human gastric and pancreatic proteases. This makes AN-PEP uniquely suited to degrading proline-rich gluten and casein peptides.
DPP-IV Exopeptidase Activity
Dipeptidyl peptidase IV cleaves dipeptides from the N-terminus of peptides containing proline or alanine in the penultimate position. This enzyme efficiently degrades exorphin-class peptides like beta-casomorphin-7 from casein and similar fragments from gluten.
Gastric pH Compatibility
Fungal proteases — unlike many bacterial enzymes — retain activity across a broad pH range (~2-7), allowing them to begin working in the acidic stomach and continue in the duodenum. This pH flexibility makes them practical oral supplements.
Clinical trials
Production and biochemical characterization of two major secreted prolyl endopeptidases (AoS28A, AoS28B) from Aspergillus oryzae, with in vitro evaluation of their ability to degrade proline-rich gluten peptides under simulated gastric conditions. (Eugster et al, Microbiology)
In vitro enzyme characterization with gluten peptide substrates.
Both AoS28A and AoS28B efficiently hydrolyzed proline-rich gliadin peptides under gastric pH conditions, with activity comparable to the previously characterized Aspergillus niger AN-PEP enzyme. Establishes broader enzyme platform for fungal-protease-based gluten degradation, the mechanistic foundation for peptidase supplements marketed for accidental gluten exposure.
Review of pharmacological strategies for managing celiac disease, including enzyme therapy approaches using prolyl endopeptidases to degrade gluten. (McCarville et al, Curr Opin Pharmacol)
Narrative review of mechanisms and trials.
The review surveys peptidase and enzyme-detoxification approaches in celiac disease, noting that prolyl endopeptidases like AN-PEP can degrade gluten in gastric simulation models and in small human trials. Authors caution that enzymes are not substitutes for the gluten-free diet and that clinical efficacy for symptom prevention remains modest in trials to date.